| 摘要 |
A system for driving an LCD backlight is provided to form a DC-DC converter in an SMPS(Switch Mode Power Supply) unit to skip unnecessary DC-DC conversion processes, thereby improving the circuit efficiency. An SMPS unit(21) has an AC-DC converter(211) for converting an externally inputted AC voltage to a DC voltage, a red LED DC-DC converter(212), a green LED DC-DC converter(213), and a blue LED DC-DC converter(214). A light source unit(23) has a substrate(231) on which red, green and blue LED arrays are arranged, a red LED constant current controller(232), a green LED constant current controller(233), and a blue LED constant current controller(234). A bridge board(22) has a wire structure for electrically connecting the red, green and blue LED DC-DC converters and the red, green and blue LED constant current controllers. |
